Geodesic
Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region
Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 2, pp. 151-161 
L. M. Muzafarov; V. P. Pavlov. Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region. Teoretičeskaâ i matematičeskaâ fizika, Tome 35 (1978) no. 2, pp. 151-161. http://geodesic.mathdoc.fr/item/TMF_1978_35_2_a1/
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     title = {Analyticity of the $3\to 3$ forward amplitude in the neighborhood of the physical region},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The general principles of quantum field theory are used to prove analyticity of the invariant amplitude in a complex neighborhood of sufficiently large above-threshold values of the invariant variables on the energy shell and to estimate the size of the neighborhood with respect to all the variables.

[1] V. P. Pavlov, TMF, 35 (1978), 3 | MR

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